why is my while loop running print _ forever

import random

#make a list of words
words = [
  'apple',
  'banana',
  'orange',
  'coconut',
  'strawberry',
  'lime',
  'grapefruit',
  'lemon',
  'kiwi',
  'blueberry',
  'melon'
]

while True:
  start = input("Press enter/return to start, or Q to quit")
  if start.lower() == 'q':
    break

  #pick rand word
  secret_word = random.choice(words)
  bad_guesses = []
  good_guesses = []

  while len(bad_guesses) < 7 and len(good_guesses) != len(list(secret_word)):
    #draw guessed letters, spaces, and strikes
    for letter in secret_word:
      if letter in good_guesses:
        print(letter, end='')
      else:
        print('_', end='')


  print('')
  print('Strikes: {}/7'.format(len(bad_guesses)))
  print('')

  #take guess
  guess = input("Guess a letter: ").lower()

  if len(guess) != 1:
    print("You can only guess a single letter!")
    continue
  elif guess in bad_guesses or guess in good_guesses:
    print("You already guessed that letter!")
    continue
  elif not guess.isalpha():
    print("You can only guess letters!")
    continue

  if guess in secret_word:
    good_guesses.append(guess)
    if len(good_guesses) == len(list(secret_word)):
      print("You Win! The word was {}".format(secret_word))
      break
  else:
     bad_guesses.append(guess)
else:
  print("You didn't get it! My secret word was {}".format(secret_word))